Metal-turning lathe



{No Model.)

N. v T HO MAS.

METAL TURNING LATHE.

Patented Aug. 19, 1884.

WITNESSES:

INVENTOR M PETERS. Phum-hflmgrlpher. Washmglon. D. c.

UNITED STATES PATENr RENE.

NICHOLAS THOMAS, O F CHICAGO, ILLINOIS.

METAL-TURNING LATHE.

SPECIFICATION forming part of Letters Patent No. 303,897, dated August19, 1884.

Applieationfiled July 14, 1883. (No model.)

To all whom it may concern.-

Be it known that I, Nrcnoms THOMAS, of Chicago, in the county of (lookand State of Illinois, have invented certain new and useful Improvementsin Metal -Turning Lathes, of which improvements the following is aspecification.

My invention relates, particularly, to lathes designed for turningshai'tiug or other metallic cylinders of considerable length; and itsobj cot is to enable the surfaces of the work which are to be acted onto be subjected to continuous lubrication during the operation at thepoints of contact of the cutting-tools, and thereby to admit of desiredincrease of speed of thelathe without heating or injuring the edges ofthe tools; and, further, to admit of the employment of any desirednumber of cutting-tools, each of which shall act upon aeontinuously-lubricated surface, and be susceptible of insertion andremoval as required without interfering with the operation of theothers.

To these ends my improvements consist in a lathe-bed constructed in theform of an opentopped box or trough; also, in the combination of a boxor trough lathe-bed and apair of cen ters whose axes are located belowthe top of said bed; also, in the combination of a box or troughlathebed and a cuttenhead connected to a carriage adapted totraverselongitudinally thereon, and carrying a series of cutting-tools;also, in the combination of a carriage, a cutter-head located therein, aseries ofeutters connected to said head, and a device for moving thecutter-head axially within the carriage.

The improvements claimed are hereinafter more fully set forth.

In the accompanying drawings, Figure 1 is a vertical longitudinalcentral section through a lathe embodying my invention; Figs. 2 and 3,vertical transverse sections through the same at the lines a; m and 1respectively, of Fig. 1; Fig. 4, an end view in elevation and on anenlarged scale of the tool-carriage and cutter head, and Fig. 5 atransverse section through the carriage with the cutter-head inelevation.

In the practice of my inventionI provide a lathe-bed, A, which is castin the form of an open-topped and closed-ended water-tight box ortrough, which is preferably semi-cylindrical, and is adapted to befilled to a proper point with water, soapsuds', or other suitable Thetool-carriage E is adapted to traverse longitudinally upon ways orshears a on the upper sides of the bed A, and receives its movementsfrom a feed-screw, c, in the ordinary manner. A cutter-head, E, isfitted within a recess in the carriage, and is secured therein by a cap,E", and locking-bolts 6 having proper nuts. The cutter-head has acentral hub, f, which forms its beari n g on the carriage, within whichis a bushing or sleeve, j", to fit the shaft to be turned, and acylindri cal proj ection or collar,f, at each end of said central hub.Each of said end collars is provided with. recesses to receive a seriesof turning-tools, F, (in this instance three for each collar,) those atone end serving as roughing-out and those at the other as finishingtools, any desired number of tools being used, and being secured byclamps and set'screws. The cutter-head is held stationary in thecarriage by a suitably key or stop, by the removal of which it may beturned upon its axes, so as to admit of the examination and removal ofany one or more of the tools which may have become dulled or injured andthe replacement thereof. Toadmit of the convenient rotation of thecutter-head for this purpose, a worm-wheel, c, is'lormed upon theperiphery of its central hub, said worm-wheel being engaged by a worm,6*, upon a vertical shaft, 6, journaled in the carriage E, and having ahandle, 6, at top, by which it may be turned,so as to bring either ofthe cutters above the surface of the liquid in the bed withoutinterrupting the operation of the lathe.

In operation, the bed A should be filled with liquid to a heightslightly below the top of the shaft D, which is to be turned, so as toallow of the proper inspection of the work as it proceeds, the toolsbeing so located that the cut ting-edges of all of them shall beentirely below the surface of the liquid. The screw 0 of the tail-stockis rotated by a pinion, c", on a IOO axes are located below the top ofsaid bed, a

shaft, 0, fitting in-bearin'gs on the'upper sidc carriage adapted totraverse the bed longitudiof the stock, and engaging a gear, 0', on thenally,'- a cutter head having a Worm-thread screw 0, thus enabling theoperator to rotate formed thereon, said head being connected to thescrew without the necessity of working in the carriage, and a Worm-wheelto engage said the liquid in the bed. thread, and journaled in thecarriage, all com- I claim as my invention and desire to secure binedand operating substantially as and for by Letters Patent 1 the purposesset forth.

A lathe-bed constructed in the form of a NICHOLAS THOMAS. water-tighttrough or box, having an open top w and closed ends, a pair oflathe-centers Whose Vitnesses:

AND. J. BASSETT, IIARRY Foo'r.

